lhz910216 发表于 2013-8-16 11:10
一开始做也选了E,觉得C awkward
但看解释的话还是觉得C好 although 应该是 separate a CLAUSE (with a ver ...
lhz910216 发表于 2013-8-16 20:13
the resulting flow pattern, with crests and troughs that remain stationary although the air that for ...
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